KR20120068147A - Apparatus and method for delivery of discared packet in broadband wireless access system - Google Patents

Abstract

PURPOSE: An apparatus and a method for transmitting discarded packets in a broadband wireless access system are provided to prevent the loss of necessary information. CONSTITUTION: An idle state is kept without the confirmation of downlink data. A conversion from the idle state to a wake-up state is implemented(303). A signaling process is implemented for converting the idle state to the wake-up state(305). Based on the signaling process, information related to the transmission of discarded downlink data is acquired(307). Referring the information related to the transmission of the discarded downlink data, the downlink data is received(309).

Description

Apparatus and method for delivering discarded packet in broadband wireless access system {APPARATUS AND METHOD FOR DELIVERY OF DISCARED PACKET IN BROADBAND WIRELESS ACCESS SYSTEM}

The present invention relates to a broadband wireless access system, and more particularly, to an apparatus and a method for later re-delivery of a packet discarded due to an unreceivable state of a terminal in a broadband wireless access system.

In the 4th generation (4G) communication system, which is the next generation communication system, active researches are being conducted to provide users with various QoS (Quality of Service) using a transmission rate of about 100 Mbps. Particularly, in 4G communication systems, studies are being actively conducted to support high-speed services in a form of guaranteeing mobility and QoS in a broadband wireless access (BWA) communication system such as a wireless local area network system and a wireless urban area network system. Is going on. In addition, the representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system.

The IEEE 802.16m system, which is one of the standards of the IEEE 802.16 system, defines a DCR (Deregistration with Content Retention) mode. In the DCR mode, the UE deregisters the network, does not receive any downlink signals, and reenters the network when generating uplink data to transmit. If uplink data of the terminal occurs, the terminal temporarily restores the connection and enters into a communication incapable state again. Therefore, the DCR mode is an operation state that is very suitable for a terminal in which transmission data is generated only on the user side.

However, even in the form of communication in which transmission data is generated mainly on the user side, it is difficult to exist at all in the downlink data in the actual communication situation. For example, downlink data reception may be required such as an emergency situation, information necessary for communication, information necessary for displaying a function of a terminal, and the like. However, even if downlink data to be transmitted to the terminal operating in the DCR mode occurs, the base station cannot deliver the downlink data to the terminal unless the terminal is out of the DCR mode.

Accordingly, an alternative for delivering downlink data to the terminal generated while the terminal operating in the DCR mode is not performing communication should be presented.

Accordingly, an object of the present invention is to provide an apparatus and method for delivering downlink data to a terminal maintaining an idle state without checking the existence of downlink data in a broadband wireless access system.

Another object of the present invention is to provide an apparatus and method for notifying of the presence of discarded downlink data when a terminal maintaining an idle state without checking for the presence of downlink data in a broadband wireless access system wakes up.

It is still another object of the present invention to provide an apparatus and method for forcing a wake-up state for downlink data transmission when a terminal which is in an idle state without checking for the presence of downlink data in a broadband wireless access system wakes up .

According to the first aspect of the present invention for achieving the above object, the operation method of the terminal in the broadband wireless access system, while maintaining the idle state without checking the presence of the downlink data, it is determined to switch to the wake-up state A process of performing signaling for switching to the wake-up state, acquiring information on downlink data transmission discarded through the signaling, and information on the downlink data transmission. And receiving link data.

According to a second aspect of the present invention for achieving the above object, a method of operating a control station in a broadband wireless access system, the downlink data to the terminal in the operating mode to maintain the idle state without checking the presence of the downlink data Occurs, discarding or buffering the downlink data, storing the information on the downlink data, and when a state change to the wake-up state of the terminal is requested, a signaling procedure for changing the state And transmitting the information regarding the discarded downlink data transmission, reacquiring the discarded downlink data, and transmitting the discarded downlink data.

According to a third aspect of the present invention for achieving the above object, a method of operating a base station in a broadband wireless access system, from the terminal in the operation mode to maintain the idle state without checking the presence of the downlink data from the wake-up state When the first message requesting the switching is received, transmitting a second message requesting a state change of the terminal to a control station, and the second message including information on discarded downlink data transmission to be transmitted to the terminal. And when a response message for the message is received, transmitting a response message for the first message including information on the discarded downlink data transmission to the terminal.

According to a fourth aspect of the present invention for achieving the above object, in the broadband wireless access system, the terminal device determines the transition to the wake-up state while maintaining the idle state without checking the existence of the downlink data, A modem that performs signaling for switching to a wake-up state and receives the downlink data by referring to a control unit that obtains information on the downlink data transmission discarded through the signaling and the information on the downlink data transmission. Characterized in that it comprises a.

According to a fifth aspect of the present invention for achieving the above object, in a broadband wireless access system, the control station apparatus generates downlink data to a terminal in an operation mode that maintains an idle state without checking whether downlink data exists. The controller discards or buffers the downlink data and stores information on the downlink data, and when a state change to the wakeup state of the terminal is requested, the discarded downlink through a signaling procedure for changing the state. And a communication unit for transmitting information about link data transmission, wherein the control unit controls to reacquire the discarded downlink data and to transmit the discarded downlink data.

According to a sixth aspect of the present invention for achieving the above object, the base station apparatus in the broadband wireless access system, the transition from the terminal in the operating mode to maintain the idle state without checking the presence of the downlink data from the wake-up state When the requesting first message is received, the second message includes a modem for transmitting a second message requesting a state change of the terminal to a control station, and information on discarded downlink data transmission to be transmitted to the terminal. And a control unit for controlling to transmit a response message for the first message including the information on the discarded downlink data transmission to the terminal when the response message is received.

In the broadband wireless access system, the downlink packet discarded during the operation in the DCR mode is transferred when the terminal wakes up later to prevent loss of necessary information.

1 is a view showing a schematic configuration of a broadband wireless access system according to an embodiment of the present invention;
2 is a diagram illustrating a signal exchange for discarded packet delivery in a broadband wireless access system according to an embodiment of the present invention;
3 is a diagram illustrating an operation procedure of a terminal in a broadband wireless access system according to an embodiment of the present invention;
4 is a diagram illustrating an operation procedure of a base station in a broadband wireless access system according to an embodiment of the present invention;
5 is a diagram illustrating an operation procedure of a control station in a broadband wireless access system according to an embodiment of the present invention;
6 is a block diagram of a terminal in a broadband wireless access system according to an embodiment of the present invention;
7 is a block diagram of a base station in a broadband wireless access system according to an embodiment of the present invention;
8 is a block diagram of a control station in a broadband wireless access system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a description will be given of a technology for delivering downlink data to a terminal maintaining an idle state without checking for the presence of downlink data in a broadband wireless access system.

In the following description, a DCR mode defined in the IEEE 802.16m system is described as an example of a state of a terminal maintaining an idle state without checking whether downlink data exists. However, the present invention is not limited to the DCR mode, and may be equally applicable to any terminal maintaining an idle state without checking the existence of downlink data.

1 is a schematic diagram of a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a system according to an embodiment of the present invention includes a terminal 110, a base station 120, a control station 130, a core network 140, and a server 150.

The terminal 110 is an end device that receives a service through a wireless access network. The terminal 110 may be a mobile device carried by a user, or may be a machine device that performs only a predetermined function without user intervention. The terminal 110 maintains an idle state without checking the existence of downlink data, and may operate in an operation mode that temporarily returns to a wakeup state only when uplink data is generated, for example, a DCR mode. .

The base station 120 communicates with the terminal 110 through a wireless channel and provides a wireless connection to the terminal 110. The base station 120 manages radio resources and allocates radio resources to the terminal 110. The control station 130 serves as a gateway between the core network 140 and the radio access network. When downlink data is generated from the core network 140 or the server 150 to the terminal 110, the control station 130 transmits the downlink data to the terminal 110, and the terminal ( Uplink data of the 110 is transmitted to the core network 140 or the server 150. According to the type of system, the control station 130 may be referred to as an Access Service Network GateWay (ASN-GW), a paging controller (PC), a mobility management entity (MME), an authenticator (Authenticator), and the like.

The core network 140 is a communication network to be connected through a wireless access network, and may be, for example, an Internet network. The server 150 is an object that implements a specific function in a wireless access network. For example, an SMS (Short Message Service) server providing a short message service and an M2M server managing M2M (Machine to Machine) terminals Can be.

2 illustrates a signal exchange for discarded packet delivery in a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 2, in step 201, the terminal 210 enters the DCR mode. In order to enter the DCR mode of the terminal, the terminal may perform signaling with the base station 220 and the control station 230. Accordingly, the control station 230 recognizes that the terminal 210 operates in the DCR mode.

In step 203, the control station 230 receives downlink data from the server or the core network in the network to the terminal 210. For example, the downlink data may be an Internet Protocol (IP) packet, an SMS packet, M2M data, or the like.

In step 205, since the control station 230 recognizes that the terminal 210 is operating in the DCR mode, it determines that the downlink data cannot be transmitted. That is, since the terminal 210 operating in the DCR mode does not check whether paging is performed, communication cannot be performed until the terminal wakes itself up. Accordingly, the control station 230 discards the downlink data and stores the related information of the downlink data. For example, the related information may include the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size or packet size of the discarded downlink data, and the discarded downlink data. It may include a resource amount or time required for transmission, information on the sender of the discarded downlink data, the time when the discarded downlink data occurs. In this case, according to another exemplary embodiment of the present disclosure, the control station 230 may buffer the downlink data without discarding it.

Thereafter, in step 207, the terminal 210 which is in the idle state determines to switch to the wake-up state and transmits a ranging request message requesting the switch to the wake-up state. For example, when uplink data to be transmitted is generated or when a predefined downlink data reception time arrives, the terminal 210 determines to switch to a wake-up state.

Accordingly, in step 209, the base station 210 receiving the ranging request message transmits a state change request message requesting a wakeup of the terminal 210. The state change request message includes a request for wakeup and a context provision request of the terminal 210 and may be referred to as an 'IM_Exit_StateChange_Req' message.

In step 211, the control station 230 receiving the state change request message transmits a state change response message to accept the state change. The state change response message may be referred to as an 'IM_Exit_StateChange_Rsp' message. The state change response message includes information on downlink data transmission discarded in step 205. The downlink data transmission information may include information indicating whether there is discarded downlink data and information related to the discarded downlink data. The downlink data transmission may further include time information for requesting to maintain the wakeup state. In this case, the information related to the discarded downlink data includes the related information stored in step 205. In addition, the time information for requesting to maintain the wake-up state means a time required for transmitting all discarded downlink data, and may be determined by referring to the size of the downlink data. As a specific example, the information on the discarded downlink data transmission may include at least one of information elements (IEs) as shown in Table 1 below.

IE size Explanation

LP_IE
(Loss Packet IE) Loss Packet Indicator (LPI) 1 bit Indicate whether any packets were discarded during DCR mode Loss packet number 2 bytes Number of packets discarded during DCR mode Loss Packet Octet Count 4 bytes Octet count of packets discarded during DCR mode


SP_IE
SMS Loss
Packet IE) SMS Loss Packet Indicator 1 bit Indicate whether there are any discarded SMS packets during DCR mode Urgent SMS Loss Packet 1 bit Indicate whether there are emergency SMS packets discarded during DCR mode SMS Loss Packet Number 2 bytes Number of SMS packets discarded during DCR mode SMS Loss Packet Octet Count 4 bytes Octet count of SMS packets discarded during DCR mode
DIR_IE Wakeup time In
seconds UE does not return to DCR mode or idle mode during Wakeup Time
Additional
Information List of source IP addresses of the discarded message List of source addresses of the discarded SMS message or the discarded urgent SMS messages

In step 213, the base station 220 receiving the state change response message transmits a ranging response message to accept the wake-up to the terminal 210. Here, the ranging response message includes information on the discarded downlink data transmission received through the state change response message.

In step 215, the terminal 210 receiving the ranging response message transmits uplink data. However, when the terminal 210 switches to the wake-up state due to the arrival of a predefined downlink data, step 215 may be omitted.

In step 217, the control station 217 reacquires downlink data discarded in step 205. For example, the control station 217 may request retransmission from the sender of the downlink data. Alternatively, when the control station 217 buffers the downlink data in step 205, the control station 217 may reacquire the downlink data by reading the downlink data stored in the buffer. . In step 219, the control station 217 transmits the downlink data to the terminal 210.

In FIG. 2, the step 217 and the step 219 are shown to be performed after the transmission of the uplink data. However, this is an example, and step 217 may be performed at any time after step 209. In addition, step 219 may be performed at any time after step 213 and step 217.

3 is a flowchart illustrating an operation procedure of a terminal in a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the terminal enters the DCR mode in step 301. In order to enter the DCR mode, the terminal performs signaling with a base station and a control station. Accordingly, the control station recognizes that the terminal operates in the DCR mode. As the UE enters the DCR mode, the UE maintains the idle state unless the UE transitions to the wake-up state at its own discretion without confirmation of the existence of downlink data, that is, paging.

After entering the DCR mode, the terminal proceeds to step 303 and determines whether it is necessary to switch to the wake-up state. The specific cause of the transition to the wake-up state may be defined differently according to the characteristics of the system and the specific embodiment. For example, when uplink data to be transmitted is generated or when a predefined downlink data reception time arrives, the terminal may determine to switch to a wake-up state.

If it is determined that the switch to the wake-up state is determined, the terminal proceeds to step 305 to perform signaling for switching to the wake-up state. That is, the terminal transmits a message requesting the transition to the wakeup state to the base station, and receives a response message to accept the transition to the wakeup state. For example, the message may be a ranging request / response message.

In step 307, the terminal determines whether information on the discarded downlink data transmission is obtained. In other words, the terminal determines whether the response message includes the information on the discarded downlink data transmission. For example, the information on the downlink data transmission may include information indicating whether there is discarded downlink data, information on the downlink data, and time information for requesting to maintain a wake-up state. The information on the downlink data includes the number of packets included in the discarded downlink data, the types of packets included in the discarded downlink data, the total size of the discarded downlink data or packet size, and the discarded downlink. It may include a resource amount or time required to transmit data, information on the sender of the discarded downlink data, the time when the discarded downlink data occurs. As a specific example, the information on the discarded downlink data transmission may include at least one of the IEs as shown in Table 1 below.

If the information on the discarded downlink data transmission is obtained, the terminal proceeds to step 309 and receives the downlink data by referring to the information on the discarded downlink data transmission. For example, when time information for requesting maintenance of the wake-up state is included, the terminal does not return to an idle state for the requested time and waits for reception of the downlink data. As another example, when information on the sender of the downlink data is included, the terminal may request data retransmission from the sender.

4 is a flowchart illustrating an operation procedure of a base station in a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in step 401, the base station determines whether a message for requesting the switch to the wake-up state is received from the terminal operating in the DCR mode. For example, the message may be a ranging request message.

When the message requesting the switch to the wake-up state is received, the base station proceeds to step 403 and transmits a message requesting the state change of the terminal to the control station. The message for requesting the state change includes a request for wakeup and a context provision request of the terminal, and may be referred to as an 'IM_Exit_StateChange_Req' message.

Thereafter, the base station proceeds to step 405 and checks whether a response message for the state change request including the information on the downlink data transmission discarded from the control station is received. The downlink data transmission information may include information indicating whether there is discarded downlink data and information related to the discarded downlink data. The downlink data transmission may further include time information for requesting to maintain the wakeup state. In addition, the time information for requesting to maintain the wake-up state means a time required for transmitting all discarded downlink data, and may be determined by referring to the size of the downlink data. As a specific example, the information on the discarded downlink data transmission may include at least one of the IEs as shown in Table 1 below.

When the response message including the information on the discarded downlink data transmission is received, the base station proceeds to step 407 and sends a response message to the terminal to the response message including the information on the discarded downlink data transmission. Send.

5 is a flowchart illustrating an operation procedure of a control station in a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the control station determines whether downlink data to the terminal operating in the DCR mode is generated in step 501. That is, the control station checks whether downlink data from the server or the core network in the network to the terminal is received. For example, the downlink data may be an IP packet, an SMS packet, M2M data, or the like.

If downlink data is generated to the terminal, the control station proceeds to step 503 and discards the downlink data and stores the relevant information of the downlink data. That is, the control station determines that the downlink data cannot be transmitted because the terminal is operating in the DCR mode, and discards the downlink data. For example, the related information may include the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size or packet size of the discarded downlink data, and the discarded downlink data. It may include a resource amount or time required for transmission, information on the sender of the discarded downlink data, the time when the downlink data occurs. However, according to another embodiment of the present invention, the control station may buffer the downlink data without discarding it. The control station then returns to step 501.

In step 501, if the downlink data does not occur, the control station proceeds to step 505 and determines whether a message for requesting a state change of the terminal operating in the DCR mode, that is, a switch to the wake-up state is received. do. The message for requesting the state change includes a request for wakeup and a context provision request of the terminal, and may be referred to as an 'IM_Exit_StateChange_Req' message.

When the message for requesting the state change is received, the control station proceeds to step 507 and determines whether downlink data to be transmitted to the terminal has been discarded due to the DCR mode, that is, discarded downlink data exists. . When the downlink data is discarded due to the DCR mode, the control station stores the related information as in step 503, so that the discarded downlink data can be determined.

If there is no discarded downlink data to be transmitted to the terminal, the control station proceeds to step 509 and transmits a response message to the state change request. The response message may include context information of the terminal and information indicating whether to accept a state change. The control station then terminates this procedure.

On the other hand, if there is discarded downlink data to be transmitted to the terminal, the control station proceeds to step 511 and transmits a response message to the state change request including information related to the discarded downlink data transmission. The information regarding the discarded downlink data transmission may include information indicating whether the discarded downlink data is present or information related to the discarded downlink data. The downlink data transmission may further include time information for requesting to maintain the wakeup state. In this case, the information related to the discarded downlink data includes the related information stored in step 503. In addition, the time information for requesting to maintain the wake-up state means a time required for transmitting all discarded downlink data, and may be determined by referring to the size of the downlink data. As a specific example, the information on the discarded downlink data transmission may include at least one of the IEs as shown in Table 1 below.

In step 513, the control station reacquires the discarded downlink data and transmits the discarded downlink data. For example, the control station may request retransmission from the sender of the downlink data. Alternatively, when the downlink data is buffered in step 503, the control station may reacquire the downlink data by reading the downlink data stored in the buffer.

6 is a block diagram of a terminal in a broadband wireless access system according to an exemplary embodiment of the present invention.

As shown in FIG. 6, the terminal includes a radio frequency (RF) processor 610, a modem 620, a storage 630, and a controller 640.

The RF processor 610 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 610 up-converts the baseband signal provided from the modem 620 into an RF band signal and transmits the signal through an antenna, and downlinks the RF band signal received through the antenna to the baseband signal. To convert. For example, the RF processor 610 may include an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like.

The modem 620 performs baseband signal and bit string conversion function according to the physical layer standard of the system. For example, according to an Orthgonal Frequency Division Multiplexing (OFDM) scheme, during data transmission, the modem 620 generates complex symbols by encoding and modulating a transmission bit stream, and maps the complex symbols to subcarriers. OFDM symbols are configured through Inverse Fast Fourier Transform (IFFT) operation and Cyclic Prefix (CP) insertion. In addition, upon receiving data, the modem 620 divides the baseband signal provided from the RF processor 610 into OFDM symbol units and restores signals mapped to subcarriers through a fast fourier transform (FFT) operation. After that, the received bit stream is recovered by demodulation and decoding.

The storage unit 630 stores data such as a basic program and an application program for the operation of the terminal. For example, when the terminal is an M2M device, the storage unit 630 stores an M2M application. The storage unit 630 provides stored data at the request of the controller 610.

The controller 640 controls the overall function of the terminal. For example, the signaling processor 644 in the controller 640 generates a control message, provides the control message to the modem 620, and interprets the control message provided from the modem 620. In addition, the mode manager 642 in the controller 640 determines an operation mode of the terminal. For example, the mode manager 642 determines to switch to the wake-up state while operating in the DCR mode. For example, when uplink data to be transmitted is generated or when a predefined downlink data reception time arrives, the mode manager 642 may determine to switch to a wake-up state. In particular, the control unit 640 switches to the wake-up state during the operation in the DCR mode, and controls the function for receiving the downlink data discarded in the idle state.

In detail, when it is determined that the mode manager 642 needs to switch to the wake-up state while operating in the DCR mode, the signaling processor 644 performs signaling for switching to the wake-up state. do. That is, the signaling processor 644 transmits a message requesting the switch to the wake-up state to the base station through the modem 620 and the RF processor 610, and accepts the switch to the wake-up state. Receive the message. At this time, the control unit 640 checks whether information on the discarded downlink data transmission is obtained through the signaling. For example, the information on the downlink data transmission may include information indicating whether there is discarded downlink data, information on the downlink data, and time information for requesting to maintain a wake-up state. The information on the downlink data includes the number of packets included in the discarded downlink data, the types of packets included in the discarded downlink data, the total size of the discarded downlink data or packet size, and the discarded downlink. It may include a resource amount or time required to transmit data, information on the sender of the discarded downlink data, the time when the discarded downlink data occurs. As a specific example, the information on the discarded downlink data transmission may include at least one of the IEs as shown in Table 1 below. When the information on the discarded downlink data transmission is obtained through the signaling, the controller 640 controls to receive downlink data with reference to the information on the discarded downlink data transmission. For example, when time information for requesting maintenance of the wake-up state is included, the controller 640 does not return to an idle state for the requested time and waits for receiving the downlink data. As another example, when information on the transmitter of the downlink data is included, the controller 640 may request the transmitter to retransmit the data.

7 is a block diagram of a base station in a broadband wireless access system according to an embodiment of the present invention.

As illustrated in FIG. 7, the base station includes an RF processor 710, a modem 720, a backhaul communication unit 730, a storage unit 740, and a controller 750.

The RF processor 710 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 710 up-converts the baseband signal provided from the modem 720 to an RF band signal and transmits the signal through an antenna, and downlinks the RF band signal received through the antenna to the baseband signal. Convert. For example, the RF processor 710 may include an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

The modem 720 performs a conversion function between the baseband signal and the bit string according to the physical layer standard of the system. For example, according to the OFDM scheme, during data transmission, the modem 720 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then performs IFFT operation and CP insertion. Through OFDM symbols are configured. In addition, upon receiving data, the modem 720 divides the baseband signal provided from the RF processor 710 into OFDM symbol units, restores signals mapped to subcarriers through an FFT operation, and then demodulates and decodes the signal. Restore the received bit string through.

The backhaul communication unit 730 provides an interface for the base station to communicate with the control station. That is, the backhaul communication unit 730 converts a bit string transmitted from the base station to the control station into a physical signal, and converts a physical signal received from the control station into a bit string. The storage unit 740 stores data such as a basic program and an application program for the operation of the base station. The storage unit 740 provides the stored data at the request of the controller 710.

The controller 750 controls the overall function of the terminal. For example, the signaling processing unit 744 in the control unit 750 generates a control message and provides the control message to the modem 720 or the backhaul communication unit 730, and from the modem 720 or the backhaul communication unit 730. Interpret the control messages provided. In particular, the controller 750 controls a function for the UE operating in the DCR mode to participate in a signaling procedure for switching to the wake-up state.

In detail, when a message for requesting the switch to the wake-up state is received from the terminal operating in the DCR mode, the controller 750 transmits a message requesting the state change of the terminal to the control station. Then, when a response message for the state change request is received from the control station, the controller 750 extracts information about discarded downlink data transmission to be transmitted to the terminal included in the response message. The downlink data transmission information may include information indicating whether there is discarded downlink data and information related to the discarded downlink data. The downlink data transmission may further include time information for requesting to maintain the wakeup state. As a specific example, the information on the discarded downlink data transmission may include at least one of the IEs as shown in Table 1 below. The controller controls the terminal to transmit a response message to the wakeup request including information on the discarded downlink data transmission.

8 is a block diagram of a control station in a broadband wireless access system according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the control station includes a communication unit 810, a storage unit 820, and a control unit 830.

The communication unit 810 provides an interface for the control station to communicate with other nodes and the core network in the network. That is, the communication unit 810 converts a bit string transmitted from the control station into a physical signal, and converts a physical signal received from the control station into a bit string. The storage unit 820 stores data such as a basic program for operating the control station, an application program, context information of connected terminals, and operation state information of terminals. The storage unit 820 provides the stored data at the request of the controller 710.

The controller 830 controls the overall function of the control station. That is, the controller 830 routes the packet of the terminal and manages context information of the terminal. In particular, the controller 830 controls a function for transmitting discarded downlink data to the terminal during the DCR mode.

In detail, when downlink data is generated to a terminal operating in a DCR mode, for example, when downlink data is received from a server or a core network in a network to the terminal, the controller 830 determines that the terminal is a DCR. Since it is operating in the mode, it is determined that the downlink data cannot be transmitted. Accordingly, the controller 830 discards the downlink data and stores the related information of the downlink data. For example, the related information may include the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size or packet size of the discarded downlink data, and the discarded downlink data. It may include a resource amount or time required for transmission, information on the sender of the discarded downlink data, the time when the discarded downlink data occurs. However, according to another exemplary embodiment of the present disclosure, the controller 830 may buffer the downlink data without buffering the downlink data.

Then, when a message for requesting the switch to the wake-up state of the terminal is received, the controller 830 transmits a response message to the state change request including information related to the discarded downlink data transmission. The information regarding the discarded downlink data transmission may include information indicating whether the discarded downlink data is present or information related to the discarded downlink data. The downlink data transmission may further include time information for requesting to maintain the wakeup state. As a specific example, the information on the discarded downlink data transmission may include at least one of the IEs as shown in Table 1 below. The controller 830 reacquires the discarded downlink data and transmits the discarded downlink data. For example, the controller 830 may request retransmission to the sender of the downlink data through the communication unit 810. Alternatively, when the downlink data is buffered, the controller 830 may reacquire the downlink data by reading the downlink data stored in the storage unit 820.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (34)

In the method of operating a terminal in a broadband wireless access system,
Determining the transition to the wake-up state while maintaining the idle state without checking the existence of the downlink data;
Performing signaling for switching to the wake-up state;
Acquiring information on the discarded downlink data transmission through the signaling;
And receiving the downlink data by referring to the information on the downlink data transmission.
The method of claim 1,
The information regarding the discarded downlink data transmission includes at least one of information indicating whether the discarded downlink data exists, information related to the discarded downlink data, and time information for requesting to maintain a wake-up state. How to.
The method of claim 2,
The information related to the discarded downlink data includes the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size of the discarded downlink data, and the information included in the downlink data. And at least one of a size of each of the packets, an amount of resources required for transmitting the downlink data, a time required for transmitting the downlink data, information on a sender of the downlink data, and a time point at which the downlink data occurs. How to feature.
The method of claim 2,
And wherein the information about the discarded downlink data transmission comprises at least one of the IEs shown in the following table.

The method of claim 1,
The process of determining the transition to the wake-up state,
Determining whether to switch to the wake-up state when uplink data to be transmitted is generated or when a predefined downlink data arrives.
The method of claim 1,
The terminal is characterized in that the M2M device.
In the method of operating the control station in a broadband wireless access system,
Discarding or buffering the downlink data when the downlink data is generated to the terminal in the idle mode without checking the existence of the downlink data;
Storing information about the downlink data;
When a state change to the wake-up state of the terminal is requested, transmitting information on the discarded downlink data transmission through a signaling procedure for changing the state;
Reacquiring the discarded downlink data;
Transmitting the discarded downlink data.
The method of claim 7, wherein
The downlink data information includes the number of packets included in the discarded downlink data, the types of packets included in the discarded downlink data, the total size of the discarded downlink data, and the packets included in the downlink data. And at least one of a size of each of them, an amount of resources required to transmit the downlink data, a time required to transmit the downlink data, information on a sender of the downlink data, and a time at which the downlink data occurs. How to.
The method of claim 7, wherein
The information regarding the discarded downlink data transmission includes at least one of information indicating whether the discarded downlink data exists, information related to the discarded downlink data, and time information for requesting to maintain a wake-up state. How to.
The method of claim 7, wherein
And wherein the information about the discarded downlink data transmission comprises at least one of the IEs shown in the following table.

The method of claim 7, wherein
The process of reacquiring the discarded downlink data,
Requesting a retransmission to the sender of the downlink data.
The method of claim 7, wherein
The process of reacquiring the discarded downlink data,
And reading the buffered downlink data.
The method of claim 7, wherein
The terminal is characterized in that the M2M device.
In the method of operating a base station in a broadband wireless access system,
When the first message requesting the transition to the wake-up state is received from the terminal in the idle mode without checking the existence of the downlink data, the second message requesting the state change of the terminal is sent to the control station. Sending process,
When a response message to the second message including information on the discarded downlink data transmission to be transmitted to the terminal is received, the response message to the first message including the information on the discarded downlink data transmission is received. Method comprising the step of transmitting to the terminal.
The method of claim 14,
The information regarding the discarded downlink data transmission includes at least one of information indicating whether the discarded downlink data exists, information related to the discarded downlink data, and time information for requesting to maintain a wake-up state. How to.
16. The method of claim 15,
The information related to the discarded downlink data includes the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size of the discarded downlink data, and the information included in the downlink data. And at least one of a size of each of the packets, an amount of resources required for transmitting the downlink data, a time required for transmitting the downlink data, information on a sender of the downlink data, and a time point at which the downlink data occurs. How to feature.
The method of claim 16,
And wherein the information about the discarded downlink data transmission comprises at least one of the IEs shown in the following table.

A terminal device in a broadband wireless access system,
While maintaining the idle state without checking the existence of the downlink data, it is determined to switch to the wake-up state, to perform the signaling for switching to the wake-up state, and to transmit the discarded downlink data through the signaling A control unit for obtaining information,
And a modem configured to receive the downlink data by referring to the downlink data transmission information.
19. The method of claim 18,
The information regarding the discarded downlink data transmission includes at least one of information indicating whether the discarded downlink data exists, information related to the discarded downlink data, and time information for requesting to maintain a wake-up state. Device.
20. The method of claim 19,
The information related to the discarded downlink data includes the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size of the discarded downlink data, and the information included in the downlink data. And at least one of a size of each of the packets, an amount of resources required for transmitting the downlink data, a time required for transmitting the downlink data, information on a sender of the downlink data, and a time point at which the downlink data occurs. Characterized in that the device.
20. The method of claim 19,
And the information about the discarded downlink data transmission includes at least one of the IEs shown in the following table.

19. The method of claim 18,
The controller may determine to switch to the wake-up state when uplink data to be transmitted is generated or when a predefined downlink data arrives.
19. The method of claim 18,
And the terminal is an M2M device.
A control station apparatus in a broadband wireless access system,
A control unit for discarding or buffering the downlink data and storing information on the downlink data when downlink data is generated to a terminal in an idle mode without checking the existence of downlink data;
When the state change request to the wake-up state of the terminal is requested, it comprises a communication unit for transmitting information about the downlink data transmission discarded through the signaling procedure for the state change,
And the controller controls to reacquire the discarded downlink data and to transmit the discarded downlink data.
25. The method of claim 24,
The downlink data information includes the number of packets included in the discarded downlink data, the types of packets included in the discarded downlink data, the total size of the discarded downlink data, and the packets included in the downlink data. And at least one of a size of each of them, an amount of resources required to transmit the downlink data, a time required to transmit the downlink data, information on a sender of the downlink data, and a time at which the downlink data occurs. Device.
25. The method of claim 24,
The information regarding the discarded downlink data transmission includes at least one of information indicating whether the discarded downlink data exists, information related to the discarded downlink data, and time information for requesting to maintain a wake-up state. Device.
25. The method of claim 24,
And the information about the discarded downlink data transmission includes at least one of the IEs shown in the following table.

25. The method of claim 24,
And the control unit reacquires the discarded downlink data by requesting a retransmission to the sender of the downlink data.
25. The method of claim 24,
And the control unit reacquires the discarded downlink data by reading the buffered downlink data.
25. The method of claim 24,
And the terminal is an M2M device.
A base station apparatus in a broadband wireless access system,
When the first message requesting the transition to the wake-up state is received from the terminal in the idle mode without checking the existence of the downlink data, the second message requesting the state change of the terminal is sent to the control station. The modem to transmit,
When a response message to the second message including information on the discarded downlink data transmission to be transmitted to the terminal is received, the response message to the first message including the information on the discarded downlink data transmission is received. Apparatus comprising a control unit for controlling to transmit to the terminal.
32. The method of claim 31,
The information regarding the discarded downlink data transmission includes at least one of information indicating whether the discarded downlink data exists, information related to the discarded downlink data, and time information for requesting to maintain a wake-up state. Device.
33. The method of claim 32,
The information related to the discarded downlink data includes the number of packets included in the discarded downlink data, types of packets included in the discarded downlink data, the total size of the discarded downlink data, and the information included in the downlink data. And at least one of a size of each of the packets, an amount of resources required for transmitting the downlink data, a time required for transmitting the downlink data, information on a sender of the downlink data, and a time point at which the downlink data occurs. Characterized in that the device.
33. The method of claim 32,
And the information about the discarded downlink data transmission includes at least one of the IEs shown in the following table.

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